Fluid-operated device.



F. H. BOGART. FLUID OPERATED DEVICE.

APPLICATIDN FILED AUG. 10. I91]- 1 28,225, 1 Patented Nov. 12, 1918.

2 SHEETSSHEET I.

III II F. H. BOGARTf FLUID OPERATED DEVICE.

APPLICATION FILED AUG. 10. 1911.

Patented Nov. 12, 1,918

2 SHEETS-SHEET 2.

. IIIIIII/I/I/l/J Philadelphia,

ESTATES PATENT. 'ouFroE.

' FRED H. BOGART, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE BOGART COMPANY, 0]? PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENNSYL- VANIA.

FLUID-OPERATED DEVICE.

To all whom it may-concern:

Be it known that I, FRED H. BOGART, a citizen of the United States, residing in Pennsylvania, have invented. certain Improvements in Fluid-Operated Devices, of which the following is a specification.

My invention relates to that form of structures known as pneumatic holding devices, usually employed for holding chucks in engagement with workto be operated upon in lathes or similar metal working machines; and the object of my invention is to provide means for quickly releasing the chuck when any particular operation upon a part supported by the chuck has been completed and it is desired to reset the chuck for the reception of another part, or to shift the position of the part previously operated upon with relation to said chuck.

My invention comprises a double-acting cylinder, having Within the same a piston suitably connected with the chuck, or with means for operating-the same; such cylinder being arranged to move the piston to the holding position by live pressure introduced on one face of the same, with means for cutting off such live pressure from the source of supply, and means for bypassing the pressure within the cylinder and previously employed for moving. the piston to the holding position, to the other side 'of the piston; thereby balancing the pressures, and means for subsequently opening that side of the cylinder originally receiving the live pressure to exhaust, so that the pressure at the other end of the same and on th'eopposite side of the piston may act upon the latter to move it to the desired position to open the chuck. a

In operating a structure of this character, I may employ a four-way valve, which is rotatable to the several positions necessary for the proper operation of the structure; first to admltlive air on one side of the piston and move it to a osition to hold the chuck in the closed position; second to cut off initial ressure; third to bypass the air from one side of the piston through the valve to the opposite side of the piston; and finally to a position permitting exhaust from the righthand side of the piston receiving the initial pressure so that the reduced pressure mayact upon the piston to move it toward the Specification of Letters Patent. Patented Nov, 12, 19 18 Application filed August 10, 1917. Serial No. 185,443.

right, or in the position shown in Figs. 1 and 2, and open the chuck. 1

These and other features of my invention I are more fully described hereinafter, reference being had to the accompanying drawmgs, in which:

Figure l, is a sectional elevation of one form of structure Within the scope of my in-;

vention.

I Fig. 3, is a sectional view on the line 111*111, Fig. 1, and

Figs. 4, 5, (Sand 7 are diagrammatic views illustrating various positions'of-the valve.

p. In the drawings, 1 represents a cylinder, 1n WlllCh may be mounted a piston 2, connected to a'rod 3, the opposite end of which 7 is operatively connected to a chuck (not shown). At the opposite side of the cylinder, '(the left side in Fig.1, of the drawings) I connect a combined air inlet and exhaust pipe 4:, having passages 5 and 6, leading from a controlling valve 7; the casing of the latter having a plurality of pipes connected therewith, and the valve having a stop 7 coacting with stops within the wall of the 'cas- I ing 1n which it is mounted. Pipe 8 leads" from a suitable source of constant pressure; pipes 9 and 9 lead to the exhaust from opposite ends of the cylinder; pipe 10 leads, to

the passage 5 in the pipe 4 communicating with the operating side of the piston to close the chuck, and pipe 11 leads to the passagefi in the pi e 4 communicating with the releasing side of the piston to open the chuck,

The piston is shown in each view in the position assumed when the'chuck is open.

In the structure illustrated in'Fig. 1, pressure is admitted from the source via pipe 8 through port 8 of the valve block 7 and pipe 10 to the passage 5 in the air inlet pipe 4, passing thence through a' passage 12 in the wall of the cylinder to theoperating or right-hand side of the piston, and the effect of such pressure on this side ofthe piston will be to-move the piston to the left and actuate the rod 3 connected to the chuck to closethe latter. For such action,

the valve will be in the position illustrated ,in Fig. 4, with its handle moved to its extreme position at the right, bringing the pipes 8 and 10 in alinement, and with the cylinder at the left-hand side of the piston open to exhaust through passage 6, and pipes 11 and 9 which are connected by a space 13 in the valve 7. As long as the valve is in this position, live pressurewill be directed to the right-hand sideof the piston, as illustrated in the drawing, to hold the chuck in the closed position.

en it is'desired to release the chuck, the pressure upon the right-hand side of the piston is to be cut off, and for this purpose the valve is-movedto the position shown in Fig. 5, cutting off initial pressure but still I keeping the left-hand side open to exhaust,

' in Fig. 7, the pipe 10 is opened to exhaust via haust.

When it is desired to close the chuck,

preliminary to bringing the bypass into operative relation. For this latter purpose,v

recess 13 and. pipe 9, and the pressure trapped in the cylinder at the left-hand side of the piston will be sufiicient to move the piston to the position shown in Fig.1,

thereby moving the rod 3 to open the chuck" When the valve is in the position shown in Fig. 7, the cylinder at the right-hand side of the piston is open to the complete exaround a iece of work, the valve is moved successive y to the positions shown in Figs. 6, 5 and 4,;respectively, and when it is in the position illustrated in Eig. 6, there I will again be a balancing of thepressures,

. erates in substantially although at considerable reduction, between the spaces on opposite sides of the piston, and when the valve is in the position shown in-Fig. 4, full pressure is flowing to the pipe 10 from the pipe 8,.thence to'the passages 5 and*12-, and to the space of the cylinder-on the right-hand side of the piston. j'

In the structure shown in Fig. 1, the cylinder is suitably fixed against longitudinal movement, but is free to rotate with the chuck. The air inlet pipe 4, however, is fixed against rotation, and packing at 15 and 16 1s provlded to insure that no leakage at these points can occur.

The structure illustrated in. Fig. 2 cpthesame manner as the structure illustrated in Fig. 1', but in this case the cylinder is fixed against longitudinal movement, while the rod 3 with the connections may move with respect to the cylinder toopen and close thechuck, and may ro-' tate. In such instance, it is necessary to some instances suitable connections may be made with the chuck opening and closing means so that the cylinder may move and the piston maintain a fixed position with reference thereto.

I claim 1. In a fluid operated. device, the combination of a cylinder, a piston therein; said provide an air inlet connection for the pipes members being movable with respect to each other and one of said members being adapted for operative connection with. an adjajacent movable part, =means for directing fluid pressure to said cylinder and to one side of said piston for actuating said movable part in one direction, and means for balancing the pressure on both sides of the piston and subsequently opening to exhaust the side receiving initial pressure; said means being constructed and arranged to prevent access of live motive fluid at this time, wherebyjan initial charge of fluid under pressure directed to one side of the piston may be by-pas'sed to the cylinder on the opposite side of the piston, confined therein, and then permitted to expand and actuate the movable part in a direction opposite to that effected by the initial charge of fluid pressure. p

. 2. In a fluid operated device, the combination of a cylindena' piston therein; one of said members being movable with respect to-the other, means for directing fluid pressure to said cylinder and to one side of said piston for efiecting movement of one of said members in one direction, and means for balancing the pressure on both sides of the piston and subsequently opening to exhaust the side reciving initial pressure;'sa1d means being constructed and arranged to prevent access of live motive fluid at this time, whereby an "initial charge of fluid under pressure directed to one side of the piston may be by-passed to the cylinder on the opposite side of the piston, confined therein, and then permitted to expand and actuate the-movable member in a direction opposite to that effected by the initial. charge I of fluid pressure; 3. In a fluid operated device, thecombi-1 nation'pf a cylinder, a piston therein movable wlth respect to the cylinder and adapted for operative connection with an adj?" cent movable part, means for directing fluid ment of the piston in a direction opposite to that eflected by the initial charge of fluid pressure.

4. In a tion of a cylinder, a piston therein; said members being movable with respect to each other and one of saidmembers being adapted to operative connection with an adjacent movable. part, a connection With a source of fluid pressure, passages for direct- ,ing fluid pressure to said ylinder and to both sides of said piston; one side of said piston receiving initial pressure only for actuating said movable part in one direction, and a valve for controlling the pressure admitted to said cylinder having means for cutting off the initial pressure acting upon one side of the piston and by-passing it tov the opposite side thereof, thereby balancing the pressure on both sides of the piston and subsequently opening to exhaust the. side receiving initial pressure; said means being constructed and arranged to prevent access fluid operated device, the combinaof 1ive motive fluid this-time, whereby an initial charge of fluid under pressure direeted to one side of the piston may be bypassed to the cylinder on'the opposite side of the piston, confined therein, and then permitted to expand and actuate the movable part in a direction opposite t that eflected by the initial charge of fluid pressure.

5. In a fluid operated device, the combination of a cylinder, a piston therein movable with respect to the cylinder, a connection with a source of fluid pressure, passages for directing fluid pressure to said cylinder and to both sides of said piston; one side of said piston receiving initial pressure only for effecting movement of said piston in one direction, and a valve for controlling the pressure admitted to sa1d cyl1nder having means for cutting off the initial pressure acting upon one side of the piston and by-passing it to the opposite side thereof, thereby balancing the pressure on 'both sides-of the piston and subsequently opening to exhaust the side receiving initial pressure; said means being constructed and arranged to prevent access of live motive fluid at this time,- whereby an initial charge of' fluid under pressure directed to one side of. the

piston may be by-passed to the cylinder on a the opposite side of the piston, confined therein, and then permitted to expand and effect movement of the piston in a direction opposite to that efi'ected by the initial charge of fluid pressure. I I

v FRED H. BOGART. 

